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QWebSettings Class

The QWebSettings 类提供对象以存储设置，用于 QWebPage and QWebFrame . 更多...

头： #include <QWebSettings>
Since: Qt 4.4

公共类型

enum FontFamily { StandardFont, FixedFont, SerifFont, SansSerifFont, CursiveFont, FantasyFont }
enum FontSize { MinimumFontSize, MinimumLogicalFontSize, DefaultFontSize, DefaultFixedFontSize }
enum WebAttribute { AutoLoadImages, DnsPrefetchEnabled, JavascriptEnabled, JavaEnabled, ..., SiteSpecificQuirksEnabled }
enum WebGraphic { MissingImageGraphic, MissingPluginGraphic, DefaultFrameIconGraphic, TextAreaSizeGripCornerGraphic, ..., SearchCancelButtonPressedGraphic }

公共函数

QString defaultTextEncoding () const
QString fontFamily (FontFamily which ) const
int fontSize (FontSize type ) const
QString localStoragePath () const
void resetAttribute (WebAttribute 属性 )
void resetFontFamily (FontFamily which )
void resetFontSize (FontSize type )
void setAttribute (WebAttribute 属性 , bool on )
void setDefaultTextEncoding (const QString & encoding )
void setFontFamily (FontFamily which , const QString & family )
void setFontSize (FontSize type , int size )
void setLocalStoragePath (const QString & path )
void setUserStyleSheetUrl (const QUrl & location )
bool testAttribute (WebAttribute 属性 ) const
QUrl userStyleSheetUrl () const

静态公共成员

void clearIconDatabase ()
void clearMemoryCaches ()
void enablePersistentStorage (const QString & path = QString())
QWebSettings * globalSettings ()
QString iconDatabasePath ()
QIcon iconForUrl (const QUrl & url )
int maximumPagesInCache ()
qint64 offlineStorageDefaultQuota ()
QString offlineStoragePath ()
QString offlineWebApplicationCachePath ()
qint64 offlineWebApplicationCacheQuota ()
void setIconDatabasePath (const QString & path )
void setMaximumPagesInCache (int pages )
void setObjectCacheCapacities (int cacheMinDeadCapacity , int cacheMaxDead , int totalCapacity )
void setOfflineStorageDefaultQuota (qint64 maximumSize )
void setOfflineStoragePath (const QString & path )
void setOfflineWebApplicationCachePath (const QString & path )
void setOfflineWebApplicationCacheQuota (qint64 maximumSize )
void setWebGraphic (WebGraphic type , const QPixmap & graphic )
QPixmap webGraphic (WebGraphic type )

详细描述

The QWebSettings 类提供对象以存储设置，用于 QWebPage and QWebFrame .

每个 QWebPage object has its own QWebSettings object, which configures the settings for that page. If a setting is not configured, then it is looked up in the global settings object, which can be accessed using globalSettings ().

QWebSettings allows configuration of browser properties, such as font sizes and families, the location of a custom style sheet, and generic attributes like JavaScript and plugins. Individual attributes are set using the setAttribute () 函数。 WebAttribute 枚举进一步描述各属性。

QWebSettings also configures global properties such as the web page memory cache, icon database, local database storage and offline applications storage.

Enabling Plugins

Support for browser plugins can enabled by setting the PluginsEnabled attribute. For many applications, this attribute is enabled for all pages by setting it on the global settings object . QtWebKit will always ignore this setting when processing Qt plugins. The decision to allow a Qt plugin is made by the client in its reimplementation of QWebPage::createPlugin ().

Web Application Support

WebKit provides support for features specified in HTML 5 that improve the performance and capabilities of Web applications. These include client-side (offline) storage and the use of a Web application cache.

Client-side (offline) storage is an improvement over the use of cookies to store persistent data in Web applications. Applications can configure and enable the use of an offline storage database by calling the setOfflineStoragePath () with an appropriate file path, and can limit the quota for each application by calling setOfflineStorageDefaultQuota ().

另请参阅 QWebPage::settings (), QWebView::settings ()，和 Web 浏览器 .

成员类型文档编制

enum QWebSettings:: FontFamily

此枚举描述由 CSS 2 定义的一般字体系列。更多信息见 CSS 标准 .

常量 值
QWebSettings::StandardFont 0
QWebSettings::FixedFont 1
QWebSettings::SerifFont 2
QWebSettings::SansSerifFont 3
QWebSettings::CursiveFont 4
QWebSettings::FantasyFont 5

enum QWebSettings:: FontSize

此枚举描述字体大小, 可配置透过 QWebSettings .

常量 值 描述
QWebSettings::MinimumFontSize 0 硬最小字体大小。
QWebSettings::MinimumLogicalFontSize 1 The minimum logical font size that is applied when zooming out with QWebFrame::setTextSizeMultiplier ().
QWebSettings::DefaultFontSize 2 用于常规文本的默认字体大小。
QWebSettings::DefaultFixedFontSize 3 用于固定间距文本的默认字体大小。

enum QWebSettings:: WebAttribute

This enum describes various attributes that are configurable through QWebSettings .

常量 值 描述
QWebSettings::AutoLoadImages 0 Specifies whether images are automatically loaded in web pages. This is enabled by default.
QWebSettings::DnsPrefetchEnabled ? Specifies whether QtWebkit will try to pre-fetch DNS entries to speed up browsing. This only works as a global attribute. Only for Qt 4.6 and later. This is disabled by default.
QWebSettings::JavascriptEnabled 1 Enables or disables the running of JavaScript programs. This is enabled by default
QWebSettings::JavaEnabled 2 Enables or disables Java applets. Currently Java applets are not supported.
QWebSettings::PluginsEnabled 3 Enables or disables plugins in Web pages (e.g. using NPAPI). Qt plugins with a mimetype such as "application/x-qt-plugin" are not affected by this setting. This is disabled by default.
QWebSettings::PrivateBrowsingEnabled 4 Private browsing prevents WebKit from recording visited pages in the history and storing web page icons. This is disabled by default.
QWebSettings::JavascriptCanOpenWindows 5 Specifies whether JavaScript programs can open new windows. This is disabled by default.
QWebSettings::JavascriptCanCloseWindows ? Specifies whether JavaScript programs can close windows. This is disabled by default.
QWebSettings::JavascriptCanAccessClipboard 6 Specifies whether JavaScript programs can read or write to the clipboard. This is disabled by default.
QWebSettings::DeveloperExtrasEnabled 7 Enables extra tools for Web developers. Currently this enables the "Inspect" element in the context menu as well as the use of QWebInspector which controls the web inspector for web site debugging. This is disabled by default.
QWebSettings::SpatialNavigationEnabled ? Enables or disables the Spatial Navigation feature, which consists in the ability to navigate between focusable elements in a Web page, such as hyperlinks and form controls, by using Left, Right, Up and Down arrow keys. For example, if a user presses the Right key, heuristics determine whether there is an element he might be trying to reach towards the right and which element he probably wants. This is disabled by default.
QWebSettings::LinksIncludedInFocusChain 8 Specifies whether hyperlinks should be included in the keyboard focus chain. This is enabled by default.
QWebSettings::ZoomTextOnly 9 Specifies whether the zoom factor on a frame applies only to the text or to all content. This is disabled by default.
QWebSettings::PrintElementBackgrounds 10 Specifies whether the background color and images are also drawn when the page is printed. This is enabled by default.
QWebSettings::OfflineStorageDatabaseEnabled 11 Specifies whether support for the HTML 5 offline storage feature is enabled or not. This is disabled by default.
QWebSettings::OfflineWebApplicationCacheEnabled 12 Specifies whether support for the HTML 5 web application cache feature is enabled or not. This is disabled by default.
QWebSettings::LocalStorageEnabled 13 Specifies whether support for the HTML 5 local storage feature is enabled or not. This is disabled by default. (This value was introduced in 4.6.)
QWebSettings::LocalStorageDatabaseEnabled LocalStorageEnabled 此枚举值被弃用。 Use QWebSettings::LocalStorageEnabled instead.
QWebSettings::LocalContentCanAccessRemoteUrls ? Specifies whether locally loaded documents are allowed to access remote urls. This is disabled by default. For more information about security origins and local vs. remote content see QWebSecurityOrigin . (This value was introduced in 4.6.)
QWebSettings::LocalContentCanAccessFileUrls ? Specifies whether locally loaded documents are allowed to access other local urls. This is enabled by default. For more information about security origins and local vs. remote content see QWebSecurityOrigin .
QWebSettings::XSSAuditingEnabled ? Specifies whether load requests should be monitored for cross-site scripting attempts. Suspicious scripts will be blocked and reported in the inspector's JavaScript console. Enabling this feature might have an impact on performance and it is disabled by default.
QWebSettings::AcceleratedCompositingEnabled ? This feature, when used in conjunction with QGraphicsWebView , accelerates animations of web content. CSS animations of the transform and opacity properties will be rendered by composing the cached content of the animated elements. This is enabled by default.
QWebSettings::TiledBackingStoreEnabled ? This setting enables the tiled backing store feature for a QGraphicsWebView . With the tiled backing store enabled, the web page contents in and around the current visible area is speculatively cached to bitmap tiles. The tiles are automatically kept in sync with the web page as it changes. Enabling tiling can significantly speed up painting heavy operations like scrolling. Enabling the feature increases memory consumption. It does not work well with contents using CSS fixed positioning (see also resizesToContents 特性)。 tiledBackingStoreFrozen property allows application to temporarily freeze the contents of the backing store. This is disabled by default.
QWebSettings::FrameFlatteningEnabled ? With this setting each subframe is expanded to its contents. On touch devices, it is desired to not have any scrollable sub parts of the page as it results in a confusing user experience, with scrolling sometimes scrolling sub parts and at other times scrolling the page itself. For this reason iframes and framesets are barely usable on touch devices. This will flatten all the frames to become one scrollable page. This is disabled by default.
QWebSettings::SiteSpecificQuirksEnabled ? This setting enables WebKit 's workaround for broken sites. It is enabled by default.

enum QWebSettings:: WebGraphic

This enums describes the standard graphical elements used in webpages.

常量 值 描述
QWebSettings::MissingImageGraphic 0 The replacement graphic shown when an image could not be loaded.
QWebSettings::MissingPluginGraphic 1 The replacement graphic shown when a plugin could not be loaded.
QWebSettings::DefaultFrameIconGraphic 2 The default icon for QWebFrame::icon ().
QWebSettings::TextAreaSizeGripCornerGraphic 3 The graphic shown for the size grip of text areas.
QWebSettings::DeleteButtonGraphic 4 The graphic shown for the WebKit -Editing-Delete-Button in Deletion UI.
QWebSettings::InputSpeechButtonGraphic 5 The graphic shown in input fields that support speech recognition.
QWebSettings::SearchCancelButtonGraphic 6 The graphic shown for clearing the text in a search field.
QWebSettings::SearchCancelButtonPressedGraphic 7 The graphic shown when SearchCancelButtonGraphic is pressed.

成员函数文档编制

[static] void QWebSettings:: clearIconDatabase ()

Clears the icon database.

[static] void QWebSettings:: clearMemoryCaches ()

Frees up as much memory as possible by cleaning all memory caches such as page, object and font cache.

该函数在 Qt 4.6 引入。

QString QWebSettings:: defaultTextEncoding () const

返回默认文本编码。

该函数在 Qt 4.6 引入。

另请参阅 setDefaultTextEncoding ().

[static] void QWebSettings:: enablePersistentStorage (const QString & path = QString())

Enables WebKit data persistence and sets the path to path 。若 path is empty, the user-specific data location specified by DataLocation will be used instead.

This method will simultaneously set and enable the iconDatabasePath (), localStoragePath (), offlineStoragePath () 和 offlineWebApplicationCachePath ().

该函数在 Qt 4.6 引入。

另请参阅 localStoragePath ().

QString QWebSettings:: fontFamily ( FontFamily which ) const

Returns the actual font family for the specified generic font family, which .

另请参阅 setFontFamily ().

int QWebSettings:: fontSize ( FontSize type ) const

返回默认字体大小对于 type .

另请参阅 setFontSize ().

[static] QWebSettings * QWebSettings:: globalSettings ()

Returns the global settings object.

Any setting changed on the default object is automatically applied to all QWebPage instances where the particular setting is not overriden already.

[static] QString QWebSettings:: iconDatabasePath ()

Returns the path of the icon database or an empty string if the icon database is disabled.

另请参阅 setIconDatabasePath () 和 clearIconDatabase ().

[static] QIcon QWebSettings:: iconForUrl (const QUrl & url )

Returns the web site's icon for url .

If the web site does not specify an icon OR if the icon is not in the database, a null QIcon 被返回。

注意： The returned icon's size is arbitrary.

另请参阅 setIconDatabasePath ().

QString QWebSettings:: localStoragePath () const

Returns the path for HTML5 local storage.

该函数在 Qt 4.6 引入。

另请参阅 setLocalStoragePath ().

[static] int QWebSettings:: maximumPagesInCache ()

Returns the maximum number of web pages that are kept in the memory cache.

另请参阅 setMaximumPagesInCache ().

[static] qint64 QWebSettings:: offlineStorageDefaultQuota ()

Returns the value of the default quota for new offline storage databases.

该函数在 Qt 4.5 引入。

另请参阅 setOfflineStorageDefaultQuota ().

[static] QString QWebSettings:: offlineStoragePath ()

Returns the path of the HTML5 client-side database storage or an empty string if the feature is disabled.

该函数在 Qt 4.5 引入。

另请参阅 setOfflineStoragePath ().

[static] QString QWebSettings:: offlineWebApplicationCachePath ()

Returns the path of the HTML5 offline web application cache storage or an empty string if the feature is disabled.

该函数在 Qt 4.6 引入。

另请参阅 setOfflineWebApplicationCachePath ().

[static] qint64 QWebSettings:: offlineWebApplicationCacheQuota ()

Returns the value of the quota for the offline web application cache.

该函数在 Qt 4.6 引入。

另请参阅 setOfflineWebApplicationCacheQuota ().

void QWebSettings:: resetAttribute ( WebAttribute 属性 )

Resets the setting of 属性 to the value specified in the global QWebSettings 实例。

This function has no effect on the global QWebSettings 实例。

另请参阅 globalSettings ().

void QWebSettings:: resetFontFamily ( FontFamily which )

Resets the actual font family specified by which to the one set in the global QWebSettings 实例。

This function has no effect on the global QWebSettings 实例。

void QWebSettings:: resetFontSize ( FontSize type )

Resets the font size for type to the size specified in the global settings object.

This function has no effect on the global QWebSettings 实例。

void QWebSettings:: setAttribute ( WebAttribute 属性 , bool on )

启用或禁用指定 属性 特征从属值对于 on .

void QWebSettings:: setDefaultTextEncoding (const QString & encoding )

指定默认文本编码系统。

The encoding , must be a string describing an encoding such as "utf-8", "iso-8859-1", etc. If left empty a default value will be used. For a more extensive list of encoding names see QTextCodec

该函数在 Qt 4.6 引入。

另请参阅 defaultTextEncoding ().

void QWebSettings:: setFontFamily ( FontFamily which , const QString & family )

将实际字体系列设为 family 为指定一般系列， which .

另请参阅 fontFamily ().

void QWebSettings:: setFontSize ( FontSize type , int size )

设置字体大小对于 type to size .

另请参阅 fontSize ().

[static] void QWebSettings:: setIconDatabasePath (const QString & path )

Sets the path of the icon database to path . The icon database is used to store "favicons" associated with web sites.

path must point to an existing directory.

Setting an empty path disables the icon database.

另请参阅 iconDatabasePath () 和 clearIconDatabase ().

void QWebSettings:: setLocalStoragePath (const QString & path )

Sets the path for HTML5 local storage to path .

For more information on HTML5 local storage see the Web Storage standard .

Support for local storage can enabled by setting the LocalStorageEnabled 属性。

该函数在 Qt 4.6 引入。

另请参阅 localStoragePath ().

[static] void QWebSettings:: setMaximumPagesInCache ( int pages )

Sets the maximum number of pages to hold in the memory page cache to pages .

The Page Cache allows for a nicer user experience when navigating forth or back to pages in the forward/back history, by pausing and resuming up to pages .

For more information about the feature, please refer to:

http://webkit.org/blog/427/webkit-page-cache-i-the-basics/

另请参阅 maximumPagesInCache ().

[static] void QWebSettings:: setObjectCacheCapacities ( int cacheMinDeadCapacity , int cacheMaxDead , int totalCapacity )

Specifies the capacities for the memory cache for dead objects such as stylesheets or scripts.

The cacheMinDeadCapacity specifies the minimum number of bytes that dead objects should consume when the cache is under pressure.

cacheMaxDead 是 maximum number of bytes that dead objects should consume when the cache is not under pressure.

totalCapacity specifies the maximum number of bytes that the cache should consume overall .

The cache is enabled by default. Calling setObjectCacheCapacities(0, 0, 0) will disable the cache. Calling it with one non-zero enables it again.

[static] void QWebSettings:: setOfflineStorageDefaultQuota ( qint64 maximumSize )

Sets the value of the default quota for new offline storage databases to maximumSize .

该函数在 Qt 4.5 引入。

另请参阅 offlineStorageDefaultQuota ().

[static] void QWebSettings:: setOfflineStoragePath (const QString & path )

集 path as the save location for HTML5 client-side database storage data.

path must point to an existing directory.

Setting an empty path disables the feature.

Support for client-side databases can enabled by setting the OfflineStorageDatabaseEnabled 属性。

该函数在 Qt 4.5 引入。

另请参阅 offlineStoragePath ().

[static] void QWebSettings:: setOfflineWebApplicationCachePath (const QString & path )

Sets the path for HTML5 offline web application cache storage to path .

An application cache acts like an HTTP cache in some sense. For documents that use the application cache via JavaScript, the loader engine will first ask the application cache for the contents, before hitting the network.

The feature is described in details at: http://dev.w3.org/html5/spec/Overview.html#appcache

path must point to an existing directory.

Setting an empty path disables the feature.

Support for offline web application cache storage can enabled by setting the OfflineWebApplicationCacheEnabled 属性。

该函数在 Qt 4.6 引入。

另请参阅 offlineWebApplicationCachePath ().

[static] void QWebSettings:: setOfflineWebApplicationCacheQuota ( qint64 maximumSize )

Sets the value of the quota for the offline web application cache to maximumSize .

该函数在 Qt 4.6 引入。

另请参阅 offlineWebApplicationCacheQuota ().

void QWebSettings:: setUserStyleSheetUrl (const QUrl & location )

Specifies the location of a user stylesheet to load with every web page.

The location must be either a path on the local filesystem, or a data URL with UTF-8 and Base64 encoded data, such as:

"data:text/css;charset=utf-8;base64,cCB7IGJhY2tncm91bmQtY29sb3I6IHJlZCB9Ow=="

注意： If the base64 data is not valid, the style will not be applied.

另请参阅 userStyleSheetUrl ().

[static] void QWebSettings:: setWebGraphic ( WebGraphic type , const QPixmap & graphic )

集 graphic to be drawn when QtWebKit needs to draw an image of the given type .

For example, when an image cannot be loaded, the pixmap specified by MissingImageGraphic is drawn instead.

另请参阅 webGraphic ().

bool QWebSettings:: testAttribute ( WebAttribute 属性 ) const

返回 true 若 属性 is enabled; otherwise returns false.

QUrl QWebSettings:: userStyleSheetUrl () const

Returns the location of the user stylesheet.

另请参阅 setUserStyleSheetUrl ().

[static] QPixmap QWebSettings:: webGraphic ( WebGraphic type )

Returns a previously set pixmap used to draw replacement graphics of the specified type .

另请参阅 setWebGraphic ().